The VCs and founders still have plenty of their shares to cash in.
Maybe someone with a better understanding can say something here but it seems like the way we do IPOs is not great. I'm not sure how to do it better, but I'm sure that there is a better way to do it. I guess this should be the next yCombinator startup. Disrupting the IPO landscape :P.
In the old days, there would have been recriminations. These days, people just shrug and think it's acceptable that the financiers lock up most of the gains for economic value created (or, depending on your thoughts of Airbnb's business model, acquired) by others.
It's one of the reasons Wall Street has fought so hard to prevent become fiduciaries again. If they were fiduciaries they couldn't get away with crap like this.